全栈: Task模型+remark字段 + 前端任务卡片初始说明展示区

backend/alembic/versions/f6a7b8c9d0e1_add_task_remark.py

@@ -0,0 +1,23 @@
+"""add_task_remark
+
+Revision ID: f6a7b8c9d0e1
+Revises: e5f6a7b8c9d0
+Create Date: 2026-08-05
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "f6a7b8c9d0e1"
+down_revision: Union[str, None] = "e5f6a7b8c9d0"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("tasks", sa.Column("remark", sa.String(2000), nullable=True, comment="任务初始描述/交接备注"))
+
+
+def downgrade() -> None:
+    op.drop_column("tasks", "remark")